Also, from what I know,
These are the 1st gen seats. Had them as a loaner and found them to be more comfortable, but definitely not as supportive as my seats.
These are the next gen seats which I have in my MS. I do not find them very comfortable and at the time that I bought them the 3rd gen (latest model, whatever you want to call them) were only available on the performance models.
Then there are the 3rd gen seats. Originally they had perforated seats, but now that is only available on the P100D. I sat in a Model X with these seats and found them to be so much more comfortable than most seats I have ever sat in. I also find perforated seats to feel softer and more comfortable, even though there is a lot of controversy towards them.